« Study and development of advanced sensors based on coated optical fiber gratings » par Monsieur Alvaro GONZALEZ VILA

Quand ?
Le 23 mai 2019 de 10:00 à 14:00
Où ?
Campus Polytech - Bâtiment Dolez - Salle Académique

Organisé par

Service d'Electromagnetisme et Telecommunications (Mme Marilina MURA)
065/37.41.47

Promoteur : Prof. Christophe CAUCHETEUR

Co-promoter: Patrice Mégret

Summary:

For certain applications, optical fiber sensors have demonstrated to provide an advantageous performance with respect to other existing platforms. Reduced size, remote monitoring or real-time operation are just some of the features that allow to obtain reliable solutions for harsh situations. Thus, this thesis is focused on the development of advanced chemical sensors using optical fiber gratings. Through the deposition of polymer, metal or metal-polymer coatings around them, the working principle of different kinds of sensors is demonstrated. The original contributions first include the deposition of a polymer coating around a tilted fiber Bragg grating, studied while developing a pH sensor working in liquid media. After that, surface plasmon resonance sensing in gaseous atmospheres is addressed, optimizing a metal coating to achieve refractive index sensing of gaseous compounds. Next, gas selectivity is obtained by using a different metal, resulting in a highly sensitive hydrogen detection sensor. The last sensor is based on a polymer film deposited around a metal-coated tilted fiber Bragg grating, aimed to provide gas sensitivity to these platforms, while using a convenient optical range. And finally, two interrogation techniques oriented to the demodulation of plasmonic sensors based on resonance combs are introduced, targeting to provide more efficient alternatives to the existing ones. Profiting from the inherent advantages of optical fibers for sensing purposes, the techniques studied and described in this text are aimed to be taken as generic approaches, leading to a broad range of applications in the detection of chemical compounds.

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